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Microchip Technology AT49F001-90PC
- Part No.:
- AT49F001-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F001-90PC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,429
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Product details
Overview
AT49F001-90PC from Atmel is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 90 ns read access time, sector-based architecture (16K boot block + two 8K parameter blocks + 32K/64K main memory), and hardware data protection. It serves as nonvolatile program/data storage in embedded microcontroller systems requiring field-upgradable firmware.
For engineers reviewing the AT49F001-90PC datasheet, AT49F001-90PC pinout, AT49F001-90PC application, or AT49F001-90PC equivalent, key selection criteria include 5V-only operation, boot block lockout capability, DATA polling/Toggle Bit erase-program status detection, and compatibility with standard EPROM-like CE/OE/WE bus interface timing.
Technical Context
The AT49F001-90PC implements a command-register-based architecture where all programming and erasure operations are initiated via six-byte software command sequences written to specific address/data latches (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H). Sector erase and chip erase are fully internalized with no external clock required.
It features dual-level hardware protection: VCC sense (program inhibited below 3.8 V), noise filtering (<15 ns pulse rejection on WE/CE), and control-line gating (OE low, CE high, or WE high disables programming). The RESET pin supports both system reset and 12 V–enabled boot block override-though the latter is disabled in the N(T) variant, which applies to this part.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly replaces 27C010 EPROMs in 8-bit bus systems. |
| Read Access Time | 90 ns max - ensures compatibility with 10 MHz Z80, 8051, and 68K-based controllers without wait states. |
| Byte Programming Time | 10 µs typical (50 µs max) - enables fast field updates of small configuration or calibration data segments. |
| Erase Cycle Time | 10 seconds max for full chip or sector - deterministic timing simplifies host firmware timeout handling. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delays during programming/erasing. |
| Write Endurance | 10,000 program/erase cycles - sufficient for firmware revision management over product lifetime. |
| Power Dissipation | 275 mW active (55 ns version), 50 mA ICC active / 100 µA ISB1 standby - suitable for low-power industrial control modules. |
Pinout & Package
AT49F001-90PC uses a 32-lead plastic dual in-line package (PDIP), 0.600" wide (package code 32P6), with industry-standard pinout compatible with JEDEC MS-001. Pin 1 is index corner, and pin 16 is GND; pin 32 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 selects upper/lower half of memory map. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; tri-stated when CE or OE high - prevents bus contention in shared-memory systems. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - enables memory-mapped decoding. |
| OE | Output Enable | Active-low output gate; used with CE to implement dual-line control and avoid bus conflicts during multi-device reads. |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data - matches standard microprocessor write timing. |
| RESET | Reset Input | Active-low system reset; halts ongoing operations and forces outputs to high-Z - critical for safe power-cycle recovery. |
| GND / VCC | Power Supply | Single 5V ±10% supply; no VPP or auxiliary voltage required - simplifies board-level power design. |
| NC | No Connect | Pin 32 in PLCC variant; not bonded in PDIP (AT49F001-90PC) - must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K boot block (00000H–03FFFH) supports permanent firmware lockdown via command sequence - prevents accidental corruption of bootloader code. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line gating eliminate spurious writes due to power transients or EMI - improves field reliability without software overhead. |
| Standard EPROM-Compatible Interface | CE/OE/WE control logic matches 27C010 timing and pinout - enables drop-in replacement in legacy designs with zero PCB changes. |
| Two Status Detection Methods | DATA polling (I/O7) and Toggle Bit (I/O6) provide redundant, real-time feedback on program/erase completion - reduces host CPU polling load and latency. |
Applications
| Industrial PLC Firmware Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in programmable logic controllers subject to frequent field updates. IC Role / Device Role / Timing Role: Nonvolatile program memory with 90 ns read access and sector-erase granularity - enables fast boot and selective firmware patching. Use Value: Boot block lockout prevents corruption of core runtime engine while allowing safe parameter block updates during maintenance cycles. | Use Scenario: Retaining calibrated sensor offsets and safety-critical operational limits in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant data storage with hardware write protection and 10,000-cycle endurance - meets IEC 62304 data retention requirements. Use Value: VCC-sense and noise-filtered WE/CE inputs prevent unintended writes during battery swaps or ESD events in clinical environments. |
| Automotive Engine Control Unit (ECU) | Telecom Base Station Configuration |
Use Scenario: Holding flash-resident boot code and adaptive tuning maps in engine management systems operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade (I-temp) Flash memory with 100 µA CMOS standby current - minimizes parasitic drain on vehicle battery. Use Value: Sector erase allows independent update of fuel injection maps without disturbing bootloader or emissions control logic stored in protected boot block. | Use Scenario: Storing FPGA configuration bitstreams and network protocol stacks in carrier-grade wireless infrastructure. IC Role / Device Role / Timing Role: High-reliability, in-system reprogrammable memory with DATA polling support - enables remote firmware upgrades without service calls. Use Value: Toggle Bit detection provides deterministic erase status for telecom-grade watchdog supervision, avoiding indefinite timeouts in mission-critical links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001BT-90EC | 48-pin TSOP, 3.3V core with 5V I/O tolerance; 90 ns access; lacks boot block lockout command set. | Requires level-shifting for pure 5V systems; no hardware-enforced boot protection - relies on software discipline. | Select if migrating to lower-voltage platforms; verify bootloader integrity via external logic or firmware checks. |
| SST39VF010-90-4C-NHE | 32-pin PDIP, 3.3V supply only; 90 ns access; includes single-byte write and auto-select mode; no RESET pin. | Not 5V-compatible; requires separate 3.3V rail; no hardware reset coordination - increases system complexity for brown-out recovery. | Choose for cost-sensitive 3.3V designs where RESET integration is handled externally; confirm VCC stability margins meet 3.3V ±10% spec. |
Compared with AM29LV001BT-90EC and SST39VF010-90-4C-NHE, the AT49F001-90PC uniquely delivers 5V-only operation with integrated boot block lockout and RESET-driven override - essential for legacy industrial controllers needing guaranteed bootloader integrity without redesign.
Availability
AT49F001-90PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device calibration data retention, and automotive ECU boot code applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49F001-90PC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F001 product line was designed as a direct 5V-only Flash replacement for UV-erasable EPROMs in embedded systems, emphasizing in-system reprogrammability, hardware data protection, and sector-level flexibility for firmware and configuration storage.
FAQ
What is the memory organization of the AT49F001-90PC?
The AT49F001-90PC contains 1 Mbit (131,072 × 8) of Flash memory organized as 128K words by 8 bits. Its sector architecture comprises one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). This layout supports secure bootloader storage and flexible field updates.
Does the AT49F001-90PC require high-voltage programming signals?
No, the AT49F001-90PC operates exclusively at 5V for both read and programming functions. It does not require VPP or auxiliary high-voltage supplies. All commands-including byte programming, sector erase, and boot lockout-are executed using standard 5V logic levels applied to CE, OE, WE, and address/data pins per documented command sequences.
How is boot block protection enabled on the AT49F001-90PC?
Boot block protection on the AT49F001-90PC is enabled via a six-cycle command sequence: write AAH to 5555H, 55H to 2AAAH, 80H to 5555H, AAH to 5555H, 55H to 2AAAH, then 40H to 5555H. Once activated, the 16K boot block (00000H–03FFFH) becomes permanently write-protected under 5.5V operation - ensuring bootloader integrity in deployed systems.
What methods does the AT49F001-90PC provide to detect end-of-program or end-of-erase?
The AT49F001-90PC offers two hardware-supported status detection methods: DATA polling (I/O7 returns complement of loaded data until completion, then true data) and Toggle Bit (I/O6 toggles between 0 and 1 during operation, then stabilizes). Both allow host firmware to poll asynchronously without fixed delays, improving system responsiveness and reliability.
Is the RESET pin on the AT49F001-90PC functional for boot block override?
No - the AT49F001-90PC is an N(T) variant, meaning the RESET pin does not support 12V override of the boot block lockout feature. While RESET provides standard system reset functionality (halting operations and forcing high-Z outputs), the 12V override capability is explicitly disabled in this version per datasheet Note on page 3 and Ordering Information tables.
AT49F001-90PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49F001-90PC FAQ
1.How can I place an order for AT49F001-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001-90PC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT49F001-90PC reliable?
The price and inventory of AT49F001-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001-90PC is usually 5 days.
3.What payment methods are accepted for AT49F001-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001-90PC?
AT49F001-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001-90PC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT49F001-90PC?
For technical support, including AT49F001-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001-90PC requirements.
6.How does Aetrix verify that AT49F001-90PC is sourced from the original manufacturer or authorized distributors?
All AT49F001-90PC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT49F001-90PC meets industry standards.
7.What is the process for return or replacement of AT49F001-90PC?
All AT49F001-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001-90PC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT49F001-90PC part is unused and in its original packaging.
Return procedure for AT49F001-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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